Why does my Audi A6's engine make a loud ticking noise?

I recently noticed that my Audi A6's engine started making a loud ticking noise while idling. What could be causing this and how can I fix it?

It's possible that your engine has a damaged valve or lifter, which is causing the ticking noise. This could be due to wear and tear or a lack of regular maintenance. I suggest taking your car to a mechanic to have it checked and repaired if necessary.

Another potential cause of the ticking noise could be low oil pressure. Make sure to check your oil levels and get an oil change if needed. If the noise persists, it's best to have a professional diagnose the issue.